The Lantac Ultimate Forward Assist precision swiss lathe-turned & manufactured from certified 4140 Cr-Mo steel, giving improvements to strength, corrosion resistance and durability over the original materials. all parts are QPQ (Quench Polish Quench) Nitrided for improved corrosion resistance and enhanced lifespan. The main Plunger spring is manufactured with the improvement of Stainless 316 music wire (as per ASTM A313) for enhanced corrosion resistance. Closed end coils are also used rather than the original open ends for improved seating and alignment. Exterior surface knurling around the caps edge allows for positive engagement with a gloved or naked hand while removing the circular ridge that exists on the current design.